TOOL FOR MACHINING WORKPIECES

• US 20160271709A9
• Filed: 10/20/2015
• Published: 09/22/2016
• Est. Priority Date: 10/15/2014
• Status: Active Grant

• Current Assignee: Kennametal Incorporated
• Original Assignee: Kennametal Incorporated
• Inventors: DENKS, Norbert, FOETTINGER, Sebastian, HEINLOTH, Markus, KURZ, Jochen, LILL, F.H. Erich, SPONSEL, Guenter
• Granted Patent: US 10,155,272 B2
• Time in Patent Office: Days
• US Class Current: 1/1
• CPC Class Codes: B23C 2270/025 Hydraulics
• CPC Class Codes: B23C 5/2234 for plate-like cutting inserts fitted on a ring or ring segment
• CPC Class Codes: B23D 2043/063 with cutters mounted externally
• CPC Class Codes: B23D 43/06 for cutting by rotational movement

Abstract

A tool (2) for machining workpieces, comprising a carrier (4) rotating in an axial direction (A) during operation, and further comprising multiple cutting segments (6), which are fastened to the carrier (4) in a radial direction (R), characterized in that at least one hydraulic clamping unit (21) is attached to the carrier (4) for clamping at least one of the cutting segments (6) to the carrier (4).

Claims

1. A tool (2) for machining workpieces, comprising a carrier (4) rotating in an axial direction (A) during operation, and further comprising multiple cutting segments (6), which are fastened to the carrier (4) in a radial direction (R),

characterized in that

at least one hydraulic clamping unit (21) is attached to the carrier (4) for clamping at least one of the cutting segments (6) to the carrier (4).

2. The tool (2) according to the preceding claim,

characterized in that

the cutting segments (4) can be reversibly fixed, by clamping, to the carrier (4) jointly by means of a clamping ring (12).

3. The tool (2) according to claim 1,

characterized in that

the carrier (4) and the clamping ring (12) are spaced apart from one another in the axial direction (A) and form a clamping groove (14) in which the cutting segments (6) are seated.

4. The tool (2) according to claim 2,

characterized in that

the clamping ring (12) can be displaced in the axial direction (A) relative to the carrier (4) for this purpose by means of the hydraulic clamping unit (21).

5. The tool (2) according to claim 2,

characterized in that

each of the cutting segments (6) has a segment base (8), which is seated in the clamping groove (14), and at least one of the parts, selected from the parts that are the carrier (4) and clamping ring (12), has a circumferential collar (22), which tapers the clamping groove (14) on a radially external section and surrounds the segment base (8).

6. The tool (2) according to claim 5,

characterized in that

the collar (22) has an oblique gripping surface (26) which points inwardly with respect to the clamping groove (14) and engages an outwardly pointing, oblique shoulder surface (28) of the segment base (8).

7. The tool (2) according to claim 2,

characterized in that

a transformation element (16), which is designed to transform a radial movement generated by the hydraulic clamping unit (21) into an axial movement of the clamping ring (12), is arranged on the carrier (4).

8. The tool (2) according to claim 7,

characterized in that

the transformation element has a clamping wedge (16), which can be displaced in the radial direction (R) by means of the hydraulic clamping unit (21) and, with a wedge surface (18), engages a wedge bearing surface (20) of the clamping ring (12) so as to axially displace the same.

9. The tool (2) according to claim 2,

characterized by

a pull-out limiter (36), which specifies a maximum axial pull-out (A_max) of the clamping ring (12) during detachment of the cutting segments (6).

10. The tool (2) according to claim 1,

characterized by

a clamping element (30), which is used to generate hydraulic pressure by means of the hydraulic clamping unit (21) and, for this purpose, can be toggled between a clamping position and a release position, so as to clamp and release the cutting segments (6).

11. The tool (2) according to claim 10,

characterized by

multiple hydraulic clamping units (21), which can be actuated jointly by means of the clamping element (30).

12. The tool (2) according to claim 10,

characterized in that

the clamping element (30) is formed as a rotating annulus, which can be toggled between the clamping position and the release position by a rotation.

13. The tool (2) according to claim 10,

characterized in that

in order to toggle between the clamping position and the release position, at least one eccentric actuating element (34) is attached on the clamping element (30) so as to actuate the hydraulic clamping unit (21) when toggling into the clamping position.

14. The tool (2) according to claim 1,

characterized in that

at least one slot nut (38) is fastened to the carrier (4) for each of the cutting segments (6) so as to position the cutting segments (6) in the circumferential direction (U).

15. The tool (2) according to claim 1,

characterized in that

the hydraulic clamping unit (21) is a self-contained assembly, which is mounted to the carrier (4).